Wrench.



WRENCH.

APPLICATION FILED SEPT. 12, 1912.

Patented Mar. 18,1913.

UNITED STATES PATENT oFFIoE.

CHARLES P. CLARK, 0F PAWTUCKET, RHODE ISLAND.

WRENCH.

Specification of Letters Patent.

Patented Mar. 18, 1913.

Application filed September 12, 1912. Serial No. 719,945.

i adjustable jaw is somewhat loose upon the shank of the wrench, so that when the jaws are applied to the sides of a nut, or the like, and a pressure is exerted upon the wrench to rotate the nut, the adjustable jaw is canted or forced out of true parallelism with the fixed jaw. The jaws in this relation holdv the nut and effect the turning of the same, but if it is desired to withdraw the wrench vfrom the nut and place the wrench at a dit'- ferent angle upon the nut, the adjustable jaw falls back into parallelism with the Xed jaw as soon as the .wrench is taken from the nut. The result is thatthe wrench has to be opened, or the adjustable jaw retracted, in order to place the wrench again on the nut.

It is with an object to overcome this ditliculty that the improved wrench has been produced.

Broadly, this invention contemplates the provision of means associated with the movable' jaw whereby to positively bind and hold t-he same in position from movement when tightened up against the sides of a nut.` This provision is made so as to produce a practically fixed or one-piece wrench wherein the jaws are immovable, and may be slipped over the sides of a nut, or the like, without any readjustment.

These objects and advantages will be more particularly pointed out and referred to in the following specification, and disclosed in the accompanying drawing showing one embodiment of the invention.

In the drawing: Figure 1 is' a side eleva tion of the improved wrench, partly in section. Fig 2 is a similar View disclosing the adjustable jaw in set position. Fig.` 3 is a section on the line 3 3 of Fig.'2.

Referring to the drawin in which like parts are designated, throng out the several views by similar characters of reference, 10 designates the shank of a wrench provided with the usual handle 11 and fixed jaw 12.

An adjustable jaw 13 is mounted to slide upon the'shank 10, and is adjusted thereon by means of the adjusting screw l-'ll threaded into the inner end of the jaw 13. and having' a knurled portion 15 for engagement with the lingers whereby to rotate the adjust-ing screw. In the usual manner, the adjusting screw is provided with la' studl seated in a correspondingly formed recess or socket provided in the inner tace of an onsetportion 17 oi the handle 11. The

knurled portion 15 ot' the adjusting screw is enlarged and projects into a registering recess formed in 'the inner edge of the shank 10 whereby to hold the adjusting screw from longitudinal movement.

' The adjustable comprises u pairof spaced straps 18 and 19 embracing` the shank l0, and joined by a web portion 20. The web portion 2O extends between the straps 18 and 19 at-their forward or outer ends.y whereby to provide an adjustable jaw registering with thexed jaw 1Q. The strap 18 is relatively thick and fornisthe face of the adjustable jaw, andl is provided with an inclined opening 21 extendingr diagonallyY backward and outward fron. the shank lo. The outer end of the -opening 2l is enlarged asat 22 and merges into a llaring opening` 23 constituting the outer end ot the opening 21. The inner end of the opening 2l is provided with .a screw-threaded wall whew-Irv to receive in threaded relation a binding screw 24. length slightly greater than the naming 2l has an outer externally threaded pw i ion tor engagement with the threaded wo" o the opening 2l; is provided with a reduved or turned-down portion extending tiiroorh the counterbore or enlargen'ient 22 'l' the opening. and terminates in a conical knul led headQG. Tlie'knnrled head 2o is pi'ri'or vably conical in forni hereby the hond may be more readily grasped and held between the fingers so that the desired pressure may be exerted upo'n the binding screw to e e curethe movable jaw 1n tixed relation to tlfe shank when desired. A pin Q7 is driven through the side of the movable jaw and r,\'- tends partly into the eonnterhore where by to engage the shoulder on the binding' portion 25. The pin 2'( is adapted to hold the binding screw from accidental displacement from the adjustable jaw 13.

The back portionsof the straps 1S and l!) The binding screw 2T is ot a screw formed by reason of -the turned-dov. n

f 'ture is hadfor the y that th Uwithout re-adjustment l l knurled surface or binding .30 when itis desired 4,5 the constitute the rear wall of the movable or adjustable jaw 13. .The back portion of the strap 18 terminates short of the end of the movable jaw 13 and inwardly of the end of 5 the binding screw 24. This peculiar strucpurpose of providing a fu-lcrum 28 for the movable jaw 13, whichl fulcrum is disposed inwardly of the point of engagement of lthe binding screw 24, so e pressure of the screw against the shank tends to tilt the movable jaw 13 back.- wardly from the fixed jaw 12, or in the position which the movable jaw assumes -when forced up against the side of a nut.

.to make the movable j aw- 13 a fixed jaw when l adjustment is once had so that the wrench may be the same nut, or to nuts of the same size of the wrench. The shank 10 preferably has a depressed 'portion 29 extending longitudinally in the forward edge of the shank, and against whichrthe end of the screw is adapted, toengage.A The milled portion 29 holds the screw from slipping when the jaw vis adjusted.

,From the above disclosure the 'operation 'of the improved' wrench is apparent, since to turn a nut or other angularly faced member, the movable jaw 13 is withdrawn from the fixed jaw 12 by rotation of the adjusting screw 14 -so as to admit of the positioning of the wrench.y aboutjthe' -anglarly faced member. The is now forced outwardly' against the angularly faced member, wheremovable `j aw 13 by to bind the movable jaw against the member and bind the jaw against the shank 40 10 so vas to take up any loose play between the movable jaw adjustment the movable jawd'assumes the. in ,full lines in Fig. 2,

-and the shank.` vIn this position disclosed wherein the jaw is canted backwardly from osition disclosed lin dot-ted lines 1n Fig. 2, wherein thejaws 12 and 13 snugly engage the opposite. sides of the nut, or ofthe memr. It is now desired to hold these jaws 12 and 13 in fixed relation, or in the relation found in one-piece or set wrenches. `To

accomplish this the binding screw.V 24 is The ' 15 object of this arrangement and operation is removed and applied repeatedly toV 'turned down through the movableA jaw 13 and against the milled portion 29 of the shank 10. Since the fulcrum 28,v or the point about which the movable jaw 13 swings when 'forced against the nut is Ldisposed inwardly ofthe extremity of the binding screw 24, the tightening of the screw 24 only tends to further swing the movable jaw 13 in the direction in which 'it is canted when brought against the nut. The wrench may nowl be removed from thenut when the binding screw 24 holds the movable jaw fall back into its normal position, as disclosed in dotted lines in Fig. 2, and will thereby be held in true adjustment for engagement with the nut at its various sides, onwith nutsor members corresponding in lsize." This structure of wrench is particu larly adaptable for use in places where a full turning of the nut or member cannot be had, and where it is necessary to remove and replace the wrench a number of timesy to complete a full turning of the nut. It will, of course, be understood that this binding screw arrangement may be added toany movable jaw inI .order to holdlit tight upon the shank whereby t'o effect a` practically .one-piece or set wrench.

I claimgl In combination with a monkey wrench having a shank with a fixed jaw, a movable jaw slidable on the shanktoward and from A the fixed jaw, and means for operating said movable jaw, abinding screw threaded at an. angle through said movable jaw and adapted to engage at its inner end with said shank, said movable jaw having its rear wall terminating inwardly of the end of the binding screw to provide a fulcrum for the movable jaw about which said jaw is adapted to positively swing under the pressure of said binding screw.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

CHARLES P. CLARK. j

copies of, this patent may be obtained for five cents eaoh, by addressing the Commissioner ot Patente,

Washington, D. 0'."

1n its canted position so that the jaw will not 

